FreeBSD Manual Pages

DEVFS(5) FreeBSD File Formats Manual DEVFS(5)
NAMEdevfs -- device file system
SYNOPSIS
devfs /dev devfs rw 0 0
DESCRIPTION
The device file system, or devfs, provides access to kernel's device
namespace in the global file system namespace. The conventional mount
point is /dev.
The file system includes several directories, links, symbolic links and
devices, some of which can also be written. In a chroot'ed environment,
devfs can be used to create a new /dev mount point.
The mknod(8) tool can be used to recover deleted device entries under
devfs.
The fdescfs(5) filesystem is an alternate means for populating /dev/fd.
The character devices that both devfs and fdescfs(5) present in /dev/fd
correspond to the open file descriptors of the process accessing the
directory. devfs only creates files for the standard file descriptors 0,
1 and 2. fdescfs(5) creates files for all open descriptors.
The options are as follows:
-ooptions
Use the specified mount options, as described in mount(8). The
following devfs file system-specific options are available:
ruleset=ruleset
Set ruleset number ruleset as the current ruleset for the
mount-point and apply all its rules. If the ruleset num-
ber ruleset does not exist, an empty ruleset with the
number ruleset is created. See devfs(8) for more infor-
mation on working with devfs rulesets.
FILES
/dev The normal devfs mount point.
EXAMPLES
To mount a devfs volume located on /mychroot/dev:
mount -t devfs devfs /mychroot/dev
SEE ALSOfdescfs(5), devfs(8), mount(8)HISTORY
The devfs file system first appeared in FreeBSD 2.0. It became the pre-
ferred method for accessing devices in FreeBSD 5.0 and the only method in
FreeBSD 6.0. The devfs manual page first appeared in FreeBSD 2.2.
AUTHORS
The devfs manual page was written by Mike Pritchard <mpp@FreeBSD.org>.
FreeBSD 11.2 February 9, 2012 FreeBSD 11.2